Question

which is the complementary mRNA strand from the following DNA template?
TTC AGC
a AAG TCG
b CCT GAT
c CCU GAU
d AAG UCG

Answer 1

To determine the complementary mRNA strand from the given DNA template, you first need to know that in transcription, the DNA template strand is used to synthesize mRNA. The base pairing rules are as follows:

- Adenine (A) pairs with Uracil (U) in RNA (instead of Thymine (T) in DNA).
- Thymine (T) pairs with Adenine (A).
- Cytosine (C) pairs with Guanine (G).
- Guanine (G) pairs with Cytosine (C).

For the DNA template provided (assuming it is the bottom strand and the top strand is the coding strand):

**Template Strand:** 5'-TTC AGC-3'
- The complementary mRNA strand will be: 5'-AAG UCG-3'

So, the correct answer is:
**d AAG UCG**